I am an 81-year-old survivor of the Holocaust. Strange things happened to me last week in Germany.

A journalist, I had been invited by a student organization at Bielefeld University and College to give a lecture on "Racism and Anti-Semitism in Hungary." My host was the left-wing anti-fascist group Antifa AG at the Bielefeld campus, located in the German state of North Rhine-Westphalia.

My lecture was scheduled to take place on November 19 at a youth center that serves as the home of a number of left-wing organizations. The event had been announced in late October, but two days before I was to appear, at a meeting of people who frequent the center, several raised an objection about my speaking there. They said they had received information that during Israel's War of Independence, when I served in the Palmach (the pre-state elite strike force of the Haganah), I had participated in a massacre in a Palestinian village. They went so far as to allege that I myself had actively participated in the killing.

Those accusing me did not name the place where this alleged massacre was committed, or provide any other details, and even acknowledged that their information was incomplete. But when pushed for corroboration, they settled the matter by explaining that "Pfeifer is a Zionist." At the same time, in an apparent - and bizarre - attempt to appear even-handed, those in attendance resolved that they also would not be willing to host someone who had been a member of the militant Palestinian organization Black September in the 1970s.

Of course, no one at the youth center asked me to respond to the accusations before they decided to rescind the invitation. Nor have any of them been willing to answer the questions of German journalists who learned about the incident regarding just why they excluded me. I only learned about what happened because it was reported to someone in Antifa by two of its members who had been present at the decisive meeting.

Fortunately, my hosts were able to organize an alternate space with limited notice, and I gave my lecture in the end. My subject was Hungary, where a recent resurgence of racist acts and statements can be observed. This includes the murder of eight Roma (Gypsies) in racial attacks during the past two years, and the shocking anti-Jewish verbal attacks in the right-wing media there and on YouTube.

As for me, I did indeed serve in the Palmach and the Israel Defense Forces from 1946 until 1950, after arriving in Mandatory Palestine in 1943. And although I left Israel in 1950, I am proud of my service as a soldier there, when we were defending ourselves against aggression and fighting for the right to have our own state. I did not participate in any massacres, but I know that improper acts were carried out by both sides in the conflict between Israel and its neighbors, as happens during wartime.

But the comparison of the Palmach with Black September, which carried out murderous acts of terrorism against civilians in the name of the Palestinian struggle, is an outrageous and ignorant one.

To accuse someone of having participated in a "massacre" - in this case, with no details and no proof - is an act of projection that is unfortunately not unusual in certain European circles. The best-known and by far the most widespread example of projection of guilt is the defamation of Israelis as the "Nazis of today." This is one of the most objectionable forms of anti-Semitism in the era after Auschwitz. As far as I can tell, my real crime apparently is being a "Zionist," which I can only understand as being guilty of being a Jew who defended himself and who favors the existence of a Jewish and democratic state. In Germany, I had the feeling that I was being judged by those arrogant anti-Semites not on the basis of what I have done or am doing, but for what I am.